Tone-arm



L. D. NADEL.

TONE ARM. APPLICATION FILED mmza, 1919.

6 5 m w n r 1 n 1 7 1 t... l M. M m m P -ir stares M FEQO LOUIS D.NADEL, OF JSFEW'ARIK NEW JERSEY, ASSIG'NOR, BY IMLE SNE ASSIGNMENTS, TOHARRIMAN NATIONAL BANK OF THE CITY OF NEW YORK, TRUSTEE.

TONE-ARM.

Specification of Letters Patent.

Patented Oct. 18, 1921.

Application filed January 23,1919. Serial No. 272,681.

r T 0 (ZZZ-whom it mag concern:

Be it known that 1, Louis D. ENADEL, a cltizen ofzthe United Statesyanda resident :of Newark, inthe county of Essex and State of-New Jersey,haveinventeda certain new and useful Tone-'Arm, -of"which the followingis aspecification.

be move'd'toward and-away from therecord disk carried by the turn-tableand which may be locked against movement when in'the latv teri'position.

The objects ofmy invention are to prov1de a tone-arm of the characterdescribed which will be-siinple in construction, effective in operation,not likely to get out of order, and in which the sound-boxwill bepositively locked in the inoperative position and cannot be accidentlyreleased, and which'is inexpensive to manufacture.

- With these and other objects in'view to be more fully set forthhereinafter, the invention consists in the novel construction,

combination of elements, and arrangement of parts'which will beexemplified in the operation "and construction hereinafter described inthe specification and illustrated in the accompanyingdrawings consideredtogether or separately.

7 In tone-arms 'of the character-described, with which I am familiar,the relatively movableme'mber offthe t'one ar'm is secured in 1tsnoperative :posltlon, away fromthe turn-table byfrictiondevices and themovable member is moved to operative position by' pressure'applied tothe sound-box.

With the type of tone-arm just above described, there is always dangerthat when the record and to the'stylus.

With my improvedtone-a'rm, two'move- 'ments are necessary to release thelock "and the membenmu'stbe'firmly grasped by the in ordertoeffectthe-unlocking. When I the member.

memberl and the spherical portion of the the unlocking is accomplishedthe stylus can be gently lowered-into contact with the record withoutdanger of injury to the record, sound-box or-stylus.

The invention will be, first described in connection with theaccompanying drawings, illustrating one :embodimentof the invention,wherein similar reference characters are used to designate correspondingparts throughout theseveral views, and then more specificallydefined'and'indicated in the appended claims.

Figure 1 is aside elevation, partly in section, of a tone-arm embodyingmy invention;

Fig. 2 is a detail sectional view taken on the line 2-2 of Fig. 1; and

Fig. 3 is a detail bottom plan view of the co-acting elements of thetone-arm.

In carrying outmy invention, 1' provide a tone-arm member lof anydesired construction and configuration. The'tone-arm is adapted to bepivoted to the top of the motor board of a cabinet in such a manner thatit may be swung over the turn-table in the plan of the turn-table as iscommon. The tone-arm member may be tapered from the base 2'to the freeend?) thereof. 'Itmaydecrease in diameter from end to end by means ofsteps, or its diameter may be reduced from the base 2 to the free end 3by a combination of tapered andstepp'ed portions.

Inthe free end 3 is pivoted an elbow 4 carrying at'its outer extremity asoundbox 5 having a reproducing stylus 6. The diameter of the elbow isless than that of the -free end 3 of the 'tone-armmember 1 andthatportion which engages within the member l is spherical inordertofill the end of A screw 7 passes through the elbow d'wher eby the latteris pivoted so as to be-capable ofpivotal movement perpendicular to thehorizontal her 1. j

A pin'8 is'loosely carried in the walls of thee lbow in proximity to thespherical poraxis of the memtion. The pin has a reduced extremity 9 atone end thereof and a peripheral groove l0 atorn'ear its center. Thepinmay be readily "removed'from the elbow through the perforation 11 withwhich that portion of the pin having the greatest diameter engages, ThePin-went ber mo rem its posit-1011 movement in the opposite directionfor the reason that the body of the pin cannot be passed through theperforation 12 with which the reduced extremity 9 of the pin enga es.

lllngaging the groove 10 of the pin 8 is the forked extremity of atrigger 13 which extends toward the open end of the elbow. A fingerpiece 14 projects from the under side of the trigger and extends througha slot 15 in the under side of the elbow.

The free extremity of the trigger 13 is provided with a downwardlyinclined spur 16 which passes through a notch 17 in the under side ofthe free end of the elbow. The free end of the tone-arm member 1 isprovided with a notch 18 in its lower wall and in line with the notch 17and the spur 16. A spring 19 is wound around the pin 8 and one extremityof the spring engages the upper wall of the elbow and the other end ofthe spring bears down on the trigger and retains the latter in positionwith the finger piece 14 in the slot 15 and the spur 16 in engagementwith the notch 17.

The operation is as follows The device is shown in operative position infull lines in Fig. 1, with the stylus resting in a record groove in therecord disk which is supported on the turntable. The engagement of thestylus with the record is by gravity. It will be noted that the soundboxand stylus may assume a position lower than that shown in full lines.

When it is desired to raise the sound-box for the purpose of changingthe record, renewing the stylus, or for any other reason, the sound-boxis grasped by the hand and raised to the position'shown in dotted linesin Fig. 1. The spring 19 will be deflected by the engagement of the spur16 with the lower wall of the member 1 and when the elbow reaches theposition shown in dotted lines the spur will be snapped into the .notch18 and the elbow will be firmly locked against downward movement.

Both hands of the operator will now be free to change the record orneedle, and no amount of force exerted in the downward direction willmove the elbow.

When it is desired to move the sound-box to playing position, the elbowor sound-box is grasped by the hand. One finger of the hand grasping themember is brought into engagement with the roughened exposed end of thefinger piece 14. Pressure of the finger against the finger piece willnot release the spur from the notch 18 but the elbow 4 must be raised anextent suflicient to permit the extremity of the spur 16 to pass thebase of the notch 18 when the trigger 13 is caused to pivot on the pin 8by the pressure on the finger piece 14. When the spur is released fromthe notch 18 the sound-box may be lowered to bring the stylus intoengagement with the record. The screw 7 on which the elbow 4 is pivotedacts as a stop to prevent excessive movement of the trigger. whichlatter will engage the screw before the spur 16 can be moved out of thenotch 17 The engagement of the spur in the notch 17, and the piece 14 inthe slot 15, will retain the trigger in the center of the elbow and theengagement of the forked end of the trigger with the groove in the pin 8will prevent withdrawal of the latter.

If, for any reason, it becomes necessary to remove the trigger or thespring 19, the screw 7 is removed and the elbow 4 is separated from themember 1. The trigger may now be moved upward until the spur and fingerpiece are disengaged from the notch and slot respectively. The jaws arewithdrawn from engagement with the groove 10. The trigger may be removedthrough the open end of the elbow, the pin withdrawn through the hole,and the spring will fall out of the elbow. To reassemble the parts theoperation just above described is reversed. p

In accordance with the provisions of the patent statutes, I havedescribed'the principle ofmy invention together with the apparatus whichI now consider to represent the best embodiment thereof, but I desire itunderstood that my invention is not confined to the particular-form ofapparatus herein shown and described, and, therefore, Iclaim broadly theright to employ all equivalent instrumen'taliti'es coming within thescope of the appended claims, and by means of which objects of myinvention are attained,

and the new results accomplished, as herein set forth, as' it is obviousthat the particular embodiments herein shown and described are onlyillustrative of some that can be employed to attain these objects andaccomplish these results.

Having now described'my invention,what I claim and desireto secure byLetters Patent is 1. A tone-arm comprising a tubular memher, a tubularelement pivoted in the member and capableof pivotal movement in thedirection perpendicular to the line of the axis of the member, a pincarriedby the element,

a trigger pivoted to the pin, a portion of said trigger projectingthrough a wall of the element, there being a notch in the member forengagement with the trigger, and a stop for limiting the, pivotalmovement: of the trigger. v

2. A tone-arm comprising a tubular member, a tubular element pivotedin'the member and capableof pivotal movement n-t'ne directionperpendicular to the line of the axis of the member, a'pin carried bythe element, a trigger pivoted to the pin, there being a slot intheelement, a portion of said trigger projecting through a slot, therebeing a notch in the member for engagement with the trigger, and a stopfor limiting the pivotal movement of the trigger.

3 A tone-arm comprising a tubular member, a tubular element pivoted inthe member and capable of pivotal movement in the directionperpendicular to the line of the axis of the member, a pin carried bythe element, a trigger pivoted to the pin, there being a slot in theelement, a portion of said trigger projecting through the slot, therebeing a notch in the member for engagement With the trigger, a stop forlimiting the pivotal movement of the trigger, and a spring formaintaining the portion in the slot.

4:. A tone-arm comprising a tubular memher, a tubular element pivoted inthe member and capableof pivotal movement in the direction perpendicularto the line of the axis of the member, a pin loosely carried by theelement, a groove in the pin, a trigger, said trigger having a notchengaging the groove in the pin, a finger piece carried by the trigger,there being a slot in the element through which the finger pieceprojects, there being a notch in the extremity of the element. a spur onthe trigger for engagement with the notch, the extremity of the memberhaving a notch for engagement of the spur to lock the element to themember, a sprin engaging the trigger and the element, the pivotconnecting the element to themember forming a stop to limit the movementof the trigger.

This specification signed and witnessed tnis 2nd day of January, 1919.

' LOUIS D. NADEL. Witnesses:

JOHN L. Lo'rsoH, M. Jones.

